XP machine can’t see network

Boss just came in and wants her laptop, running XP SP2, to connect to the internet. Setting it up like usual, using wired connection straight into the net. hub. Done this on the same network with a few other machines w/ no probs. For some reason, even though I assigned laptop to workgroup, etc.. computer can’t see network/workgroup computers.
It can ping them, and the default gateway, and no problem getting out to internet on shared connection, dhcp assigned all addresses just fine. Even tried running net. setup wizard – didn’t work.
Any ideas? helppp